ATMOSPHERIC DEPOSITION FLUXES OF DIOXINS ATAN IDUSTRIAL SITE AND A RURAL SITE IN JAPAN
Atmospheric deposition is a key route for dioxins to transport from emission sources to ecological receptors. Atmospheric bulk deposition of dioxins (PCDD/Fs and co-PCBs) was measured monthly over a year at an industrial site and a rural site in Japan to assess the deposition fluxes and seasonal variations. Daily average deposition flux was 83 pg-TEQ/m2/day for the industrial area, and 33 pg-TEQ/m2/day for the rural area. Rural area showed a lower deposition flux than industrial area, but both of the areas showed higher deposition fluxes than the average value of Japan (21pg-TEQ/m2/day, 1998) investigated by Japanese Environmental Agency in 1998. The contributions of co-PCBs were about 5％ of the total TEQ in both areas. With temperature decrease from autumn to winter, the dioxin flux increased at the industrial area, but lightly decreased at the rural area, showing a different seasonal variation trend in deposition fluxes in the two areas. It was also found that the lower chlorinated PCDD/Fs accounted for higher percentage in the industrial area than that in the rural area.
Oh K Nojiri K
Center for Environmental Science in Saitama,Kamitanadare 914,Kisai,Saitama 347-0115,Japan
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）